Sebastian Haase wrote: > On Monday 17 July 2006 12:38, Travis Oliphant wrote: > > Any idea on my main question ? > What is the dot product of a 2x2 and 3x2x3 supposed to look like ? > Why are numarray and numpy giving different answers ?? >
I'm pretty sure the dot-product in Numeric (and I guess numarray too) was broken for larger than 2-dimensions. This was fixed several months ago in NumPy. NumPy dot-product gives the following result a.shape is (I,L) b.shape is (J,L,K) Then c=dot(a,b) will have c.shape = (I,J,K) with c[i,j,k] = sum(a[i,:]*b[j,:,k]) I'm not even sure what Numeric is computing in this case. -Travis ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
